Tool-maker&#39;s button



A. H. STARRETT.

TOOL MAKER'S BUTTON.

APPLICATION FILED APR. 10. 1920.

1,365,203. v Patented Jan. 11,1921.

1 FFJII 5 Q I 1 w o o FIGIIV fig 5106/12/01 1 J I 3 l'illllcfifl'fll'mil I l m" 1 I 01 2 36/ I y UNITED STATES P A TENT OFFICE.

ARTHUR HERMONE STARRETT, OE ATHOL, MASSACHUSETTS, ASSIGNOR TO THE L. S.

STABRETT COMPANY, OF ATHOL, MASSACHUSETTS, A CORPORATION OF MASSA- CHUSETTS.

TOOL-MAKERS BUTTON.

Specification of Letters Patent.

Patented Jan. 11, 1921.

To all whom it may concern:

Be it known that I, ARTHUR H. STARRETT, a citizen of the United States, residing at Athol, county of Worcester, Commonwealth of Massachusetts, have invented certain new and useful Improvements in Tool-Makers Buttons, of which the following is a specification.

This invention relates to tool-makers buttons, and particularly to the type of button set heretofore introduced in the trade by The L. S. Starrett Company as No. 494 of its catalogue. The general methods of using buttons of this type are old and well known in machinists practice in laying out work and no claim is made to such use nor to the :form of the commercial article as shown in said catalogue, the same having been in public use for many years.

My present invention relates to an improvement of such sets whereby the accuracy and utility of such sets is preserved and increased and the sets made more dependable and convenient, as will hereinafter appear.

For the better understanding of my invention I have shown in the accompanying drawings both the structure of my improved button set, and diagrammatically, something of their use. Throughout specification and drawings I have employed like reference characters to identify corresponding parts, and in the drawings Figure I is a side elevation of a set of tool-makers buttons in accordance with my invention.

Figs. II and III are top and bottom plan views respectively thereof, and

Fig. IV is' an enlarged detail section of one of the buttons.

As is well known, tool-makers buttons or positioning buttons as they are sometimes termed, are used where positive accuracy is required in locating holes to be chucked and bushed for drill, jig, die and fixture work. and consists of hardened steel cylinders which are supported by screws passing loosely through their centers. These screws are adapted to be locked in difierent positions of adjustment by friction washers which are,

disposed under the screw heads and to bear against the ends of the buttons.

I have indicated at l a base plate or holder for a set of tool-makers buttons 6 of the general type and structure illustrated in the Starrett catalogue referred to hereinabove.

The holder 1 is provided with a spaced series of relatively shallow grooves or sock ets 2, to receive the lower ends of the button cylinders 6 which are clamped to the holder by means of the same screws 5 and 'lriction washers 8 which are used to clamp the buttons to the working points of the jig piece, the base plate 1 being pierced within the recesses 2, as indicated at 2, to receive the shanks of the screws. The heads of the screws are indicated at 4:, and the diameter of each cylinder bore is larger than that of the inclosed screw shank so as to provide a space 7 about each screw shank, which space permits the cylinders to be adjusted slightly relative to the screws until they are brought to the desired location.

Inasmuch as the cylinders are carefully ground to size and all measurements are made from them, it is essential that they be protected against injury. As here shown the sockets 2 with the screws 5 define the position of the cylinders on the holder, and the holder is formed with a depending peripheral flange or rim 1 which -incloses the lower ends of the screws and protects them from injury. The rim 1 terminates in a flat bottom edge and is of sufiicient height to clear the projecting ends 3 of the screws 5, whereby the set of buttons may be stood in upright position upon a flat support, as a machinists bench.

The particular form of holder 1 here shown enables the button set to be placed in upright position upon a bench and permits the machinist to readily remove or return any button with the minimum effort.

Various modifications in the form and construction of my device may obviously be resorted to if within the limits of the appended claims.

That I therefore claim anddesire to se-, cure by Letters Patent:

1. A holder for a set of tool-makers buttons consisting of a base plate having annular recesses adapted to receive the lower ends of the button cylinders and having within said recesses holes adapted to receive the lower ends of the button screws, where-' by to define the position of the buttons on the plate, and having a depending rim inclosing and protecting the ends of the screws projecting through said holes.

2. A holder for a set of tool-makers buttons consisting of a base plate having holes adapted to receive the lower ends of the button screws whereby to define the position of the buttons on the plate, and having a depending rim inclosing and protecting the ends of the screws projecting through said holes.

8. A holder for a set of tool-makers buttons consisting of a flat base plate having holes adapted to receive the lower ends of the button screws whereby to define the position of the buttons on the plate, and having a depending Vertical rim inclosing and protecting the ends of the screws projecting through said holes and terminating in a fiat lower edge permitting the holder to he stood in upright position upon a fiat surface.

ARTHUR HERMONE STARRETT. Vitnesses:

WILLIAM E. (JRAMER, ERNEST W. TAYLOR. 

